A Entered into an Agency Agreement with Agent B

Multiple Choice

A entered into an agency agreement with agent B. B entered into a contract under seal with third party C. A was not named in the contract but B described herself as "agent". Which one of the following statements is best applied to these facts?

A) A and C can sue B on the contract.
B) A may sue C or be sued by C on the contract.
C) B may sue C or be sued by C on the contract.
D) A may sue C and B on the contract.
E) C may sue A and B on the contract.